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近垒能区重离子熔合裂变反应的研究有助于理解重离子核反应运动学的演化过程,同时也为人工合成超重核提供重要的理论支撑。对于较重体系,准裂变成分的出现会使得反应体系裂变碎片的质量分布宽度比纯粹的全熔合裂变要大,所以裂变碎片质量分布宽度是鉴别是否存在准裂变成分的一个重要判据。基于该认识,在近垒及垒下能区测量了~(28)Si+~(174)Yb体系的裂变碎片质量分布,以研究其裂变机制。
The study of heavy ion fusion fission reaction in near-base energy region is helpful to understand the kinetics evolution of heavy ion nuclear reaction and provide important theoretical support for the synthesis of super-heavy nuclei. For heavier systems, the presence of quasi-fission components makes the mass distribution width of fissile fragments larger than that of purely fusional fission. Therefore, the mass distribution width of fission fragments is an important criterion to identify the existence of quasi-fission components. Based on this understanding, the fission fragment mass distribution of ~ (28) Si + ~ (174) Yb system was measured in the near base and basement energy regions to study its fission mechanism.